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Earnings Per Share (Net Income Attributable To CME Group) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Dividends, Preferred Stock	$ (5.0)	$ (4.6)	$ (15.1)	$ (13.8)
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	(4.4)	(3.9)	(15.2)	(12.1)
Net Income Attributable to Common Shareholders of CME Group	$ 740.8	$ 671.1	$ 2,381.3	$ 2,027.2
Basic (in shares)	359,020	358,715	358,965	358,655
Effect of stock options, restricted stock and performance shares	599	573	483	551
Diluted (in shares)	359,619	359,288	359,448	359,206
Earnings per common share, basic (in dollars per share)	$ 2.06	$ 1.87	$ 6.63	$ 5.65
Earnings per common share, diluted (in dollars per share)	$ 2.06	$ 1.87	$ 6.62	$ 5.64

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